Wiring diagram - Find my mistakes!
Dear Community, I am at the initial phase of my camper van conversion in China, in which I am planning to live and work together with my wife. Camper vans in China are not popular though they produ...
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Thanks for your contribution guys and please forgive my inexperience regarding image posting, will do that next time.
It's 220v.
@CA Traveler: Thanks a lot, your answer is super helpful!
The chassis/starter battery is lead acid, the house battery is Lithium, so I read the safe only way to charge the second from the first is to use a DC-DC charger instead of relays so that it can keep a steady 14.6v charge.
You've hit a painful spot! I am building this van in the countryside with limited tools and shops, everthing must be ordered online and it takes days to arrive, so I asked the solan panel company to wire the panels for me to save time. I asked for 10 AWG cables but later I thought I had made a mistake because I only calculated half the wire lenght so, despite myself, I thought I had to rewire the "long sides" with 6 AWG cables. But from your reply I understand my first calculation (10 AWG) was probably correct, right?
Here are the panel specs of each panel (translated from Chinese, no instruction manuals, only a minimal label on the back):
Peak power: 300W
Open circuit voltage: 22.5V
Short circuit current: 16. 6A
Working voltage: 18V
Working current: 15.5A
Total length of the cables is 3+3=6m (20ft). As they are in a series, the max current going through them is 16.6A?
From the MPPT to the battery there will be 40.8A and max 1ft distance, so I chose 6 AWG. From the inverter (1000w) to the battery I expect 100-120A max so 2 AWG should be enough but I wanted to cover for unexpected peaks up to 2000w if the CB fails so I chose 2/0 AWG. Useless?
My bad, I meant to connect the ground to the black cable in the diagram.
Thanks again!
Is China shore voltage 220 Volts or 120 Volts?
It's 220v.
@CA Traveler: Thanks a lot, your answer is super helpful!
What is the reason for the DC-DC charger?
The chassis/starter battery is lead acid, the house battery is Lithium, so I read the safe only way to charge the second from the first is to use a DC-DC charger instead of relays so that it can keep a steady 14.6v charge.
Your solar has both 10 and 6 ga wires, should be the same.
You've hit a painful spot! I am building this van in the countryside with limited tools and shops, everthing must be ordered online and it takes days to arrive, so I asked the solan panel company to wire the panels for me to save time. I asked for 10 AWG cables but later I thought I had made a mistake because I only calculated half the wire lenght so, despite myself, I thought I had to rewire the "long sides" with 6 AWG cables. But from your reply I understand my first calculation (10 AWG) was probably correct, right?
Here are the panel specs of each panel (translated from Chinese, no instruction manuals, only a minimal label on the back):
Peak power: 300W
Open circuit voltage: 22.5V
Short circuit current: 16. 6A
Working voltage: 18V
Working current: 15.5A
Total length of the cables is 3+3=6m (20ft). As they are in a series, the max current going through them is 16.6A?
Wires should be as short as possible
From the MPPT to the battery there will be 40.8A and max 1ft distance, so I chose 6 AWG. From the inverter (1000w) to the battery I expect 100-120A max so 2 AWG should be enough but I wanted to cover for unexpected peaks up to 2000w if the CB fails so I chose 2/0 AWG. Useless?
the red AC wire grounded
My bad, I meant to connect the ground to the black cable in the diagram.
Thanks again!
